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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
clapperboard is a noun meaning "photographic equipment used to synchronize sound and motion picture; boards held in front of a movie camera are banged together". It carries one recorded sense.
photographic equipment used to synchronize sound and motion picture; boards held in front of a movie camera are banged together
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for clapperboard come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.